13
POSITIONING ON CURB
For full perimeter curbs CRRFCURB074A00 and 075A00, the
clearance between the roof curb and the front and rear base rails
should be
1
/
4
-in. (6.4 mm). The clearance between the curb and
the end base rails should be
1
/
2
-in. (13 mm). For retrofit applica
-
tions with curbs CRRFCURB003A01 and 4A01, the unit should
be position as shown in Fig. 8. Maintain the 15
1
/
2
-in. (394 mm)
and 8
5
/
8
-in. (220 mm) clearances and allow the 22
5
/
16
-in.
(567 mm) dimension to float if necessary.
If the alternative condensate drain location through the bottom of
the unit is used in conjunction with a retrofit curb, the hole in the
curb must be moved 12
1
/
2
-in. (320 mm) towards the end of the
unit. (See Fig. 9.)
Although unit is weatherproof, guard against water from higher
level runoff and overhangs.
Remove all shipping materials and top skid. Remove extra center
post from the condenser end of the unit so that the condenser end
of the unit matches Fig. 29 and 30. Recycle or dispose of all ship
-
ping materials.
Fig. 8 —
Retrofit Installation Dimensions
Fig. 9 —
Alternative Condensate Drain Hole Positions
Step 7 —
Convert to Horizontal and Connect
Ductwork (when required)
Unit is shipped in the vertical duct configuration. Unit without fac
-
tory-installed economizer or return-air smoke detector option may
be field-converted to horizontal ducted configuration using acces
-
sory CRDUCTCV002A00. To convert to horizontal configura
-
tion, remove screws from side duct opening covers (see Fig. 10)
and remove covers. Discard the supply duct cover. Install accesso
-
ry CRDUCTCV002A00 to cover the vertical supply duct opening.
Use the return duct cover removed from the unit end panel to cov
-
er the vertical return duct opening. Use the screws to install the
covers on vertical duct openings with the insulation-side down.
The panels must be inserted into the notches on the basepan to
properly seal. The notches are covered by the tape used to secure
the insulation to the basepan and are not easily seen. See Fig. 11
for position of the notches in the basepan. Seals around duct open
-
ings must be tight. Secure with screws as shown in Fig. 12. Cover
seams with foil duct tape.
Field-supplied flanges should be attached to horizontal duct open
-
ings and all ductwork should be secured to the flanges. Insulate
and weatherproof all external ductwork, joints, and roof or build
-
ing openings with counter flashing and mastic in accordance with
applicable codes.
Do not cover or obscure visibility to the unit’s informative data
plate when insulating horizontal ductwork.
Fig. 10 —
Horizontal Conversion Panels
Fig. 11 —
Location of Notches
IMPORTANT: If the unit has the factory-installed thru-the-base
option, make sure to complete installation of the option before
placing the unit on the roof curb.
See the following sections:
• Factory-Option Thru-Base Connections (Gas Connec
-
tion) on page 16
• Factory-Option Thru-Base Connections (Electrical Con
-
nections) on page 29
NOTE: If gas and/or electrical connections are not going to occur
at this time, tape or otherwise cover the fittings so that moisture
does not get into the building or conduit in the interim.
ORIGINAL
POSITION
NEW POSITION
(MOVED 12.5 IN.)
REMOVABLE HORIZONTAL
SUPPLY DUCT OPENING COVER
REMOVABLE HORIZONTAL
RETURN DUCT OPENING COVER
BASEPAN
NOTCHES
NOTCHES
Summary of Contents for 48LC Series
Page 5: ...5 Fig 2 Unit Dimensional Drawing Size 08 Unit ...
Page 6: ...6 Fig 2 Unit Dimensional Drawing Size 08 Unit cont ...
Page 7: ...7 Fig 3 Unit Dimensional Drawing Size 09 and 12 Units ...
Page 8: ...8 Fig 3 Unit Dimensional Drawing Size 09 and 12 Units cont ...
Page 11: ...11 Fig 6 Roof Curb Details Size 08 12 Units ...
Page 21: ...21 Fig 34 48LC 08 12 Electro mechanical Control Wiring Diagram ...
Page 22: ...22 Fig 35 48LC 08 12 RTU Open Control Wiring Diagram ...
Page 23: ...23 Fig 36 48LC 08 12 SystemVu Control Wiring Diagram ...
Page 25: ...25 Fig 38 48LC 08 12 Typical Power Wiring Diagram SystemVu Control 208 230 v Unit Shown ...
Page 61: ......